Vibration isolator

Abstract

The utility model provides a vibration isolator which is characterized by at least comprising a viscous damping vibration attenuation ring, a supporting ring outer ring, a supporting ring inner ring, a collecting unit and an actuating unit. The viscous damping vibration attenuation ring is fixedly arranged between the supporting ring outer ring and the supporting ring inner ring, the collecting unit is arranged on the supporting ring inner ring, the actuating unit is arranged on the supporting ring outer ring, and the collecting unit is in communication connection with the actuating unit through the control unit; the acquisition unit acquires a vibration signal of the inner ring of the support ring and then feeds back the vibration signal to the control unit, and the control unit sends an action instruction to the actuating unit, so that the actuating unit drives the outer ring of the support ring to generate deformation which is opposite to the vibration in phase, thereby counteracting the vibration and realizing active vibration suppression.

Description

TECHNICAL FIELD

[0001] The utility model relates to spaceflight carrier rocket technical field especially relates to a vibration isolator. BACKGROUND

[0002] When the rocket is launched, the engine works, aerodynamic force, etc. can cause strong vibration. The effective load carried usually contains a large number of high-precision, high-sensitivity instruments and equipment, such as the communication antenna of the satellite, the sensor, the optical lens, etc. These instruments are extremely sensitive to vibration, and a slight vibration can cause displacement and damage to the internal components, affecting their performance and precision. For some effective loads that need to maintain a specific attitude in space, such as astronomical telescopes, earth observation satellites, etc., vibration can interfere with their attitude control system. In addition, electronic devices on the rocket, such as computers of the control system, sensors, power modules, etc., contain a large number of electronic components, and vibration can cause the pins of the electronic components to break and the solder joints to fall off, causing circuit short circuit, open circuit, etc. fault, making the electronic device unable to work normally. Through vibration isolation, the influence of vibration on each system of the rocket can be effectively reduced, and the probability of failure caused by vibration can be reduced. This helps to improve the success rate of rocket launch, ensure the smooth progress of the task, and reduce the huge economic loss and scientific research delay caused by the failure of launch.

[0003] Passive vibration control does not require external energy, the device is simple, easy to implement, economical and reliable. Although passive vibration control has energy loss characteristics, it can basically maintain stability during shock absorption, so the shock absorption effect is satisfactory in many application scenarios. However, passive vibration control lacks flexibility and has limited control effect on low frequency.

[0004] Therefore, there is an urgent need to provide a vibration isolator that can suppress vibration quickly and widely. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, the utility model provides a vibration isolator which adopts the combination of active vibration control and passive vibration control to achieve the purpose of wide-frequency vibration suppression.

[0006] The utility model provides a vibration isolator at least includes: viscous damping vibration ring, support ring outer ring, support ring inner ring, acquisition unit and actuating unit, viscous damping vibration ring is fixedly arranged between support ring outer ring and support ring inner ring, acquisition unit is arranged in support ring inner ring, actuating unit is arranged in support ring outer ring, acquisition unit is connected with actuating unit through control unit, acquisition unit feeds back to control unit after obtaining the vibration signal of support ring inner ring, control unit sends action instruction to actuating unit, makes actuating unit drive support ring outer ring to produce deformation of opposite phase with vibration, thereby offsetting vibration and realizing active vibration suppression.

[0007] In one embodiment, the acquisition unit comprises a plurality of piezoelectric fiber sensors evenly distributed in the inner ring of the support ring.

[0008] In one embodiment, the actuation unit comprises a plurality of piezoelectric fiber actuators evenly distributed in the outer ring of the support ring.

[0009] In one embodiment, each piezoelectric fiber actuator is telescopically attached to the outer ring of the support ring.

[0010] In one embodiment, the controller comprises a signal acquisition unit, a control algorithm unit and a signal amplification unit; one end of the signal acquisition unit is in communication connection with the piezoelectric fiber sensor, and the other end is in communication connection with the input end of the control algorithm unit; the output end of the control algorithm unit is in communication connection with the piezoelectric fiber actuator through the signal amplification unit.

[0011] In one embodiment, the number of piezoelectric fiber sensors is the same as that of piezoelectric fiber actuators.

[0012] In one embodiment, there are six piezoelectric fiber sensors; there are six piezoelectric fiber actuators.

[0013] In one embodiment, the vibration isolator of the utility model further comprises a connector for connecting with external equipment; the connector is arranged on the outer ring of the support ring.

[0014] In any one of the above embodiments, the vibration isolator of the utility model further comprises an energy component connected with the acquisition unit, the actuation unit and the control unit respectively; the energy component is used for providing energy for the acquisition unit, the actuation unit and the control unit.

[0015] In one embodiment, the acquisition unit at least comprises an NI board card.

[0016] The vibration isolator provided by the utility model has at least one of the following beneficial effects:

[0017] Firstly, the vibration isolator has good flexibility, high piezoelectric constant and electromechanical coupling coefficient, and high sensitivity.

[0018] Secondly, the vibration isolator collects vibration signals through the piezoelectric fiber sensor, forms feedback to adjust the shear deformation of the viscous damping vibration ring, so that the shear deformation of the viscous damping structure is further strengthened, and the ability of structural vibration energy dissipation is improved.

[0019] Third, the vibration isolator of the utility model, through viscous damping structure can easily realize the suppression of high frequency vibration, and through active constraint damping structure can control low frequency vibration, make it in very wide frequency range all maintained higher damping characteristic, thereby reach the purpose of wide frequency vibration control.

[0020] Fourth, the passive damping part of the vibration isolator of the utility model can improve the feedback gain and phase margin of the system, and can also eliminate the control overflow problem caused by structural model uncertainty.

[0021] After reading the detailed description and after viewing the drawings, those skilled in the art will recognize additional features and advantages. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiments will be briefly introduced below, obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0023] Figure 1 It is the overall structure schematic diagram of the vibration isolator of the utility model embodiment.

[0024] Figure 2 It is the isometric view of the vibration isolator of the utility model embodiment.

[0025] Figure 3 It is the front view of the vibration isolator of the utility model embodiment.

[0026] Figure 4 It is the vibration curve comparison chart before and after the vibration isolator of the utility model is connected. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of each aspect of the utility model will be described in detail below, in order to make the purpose, technical scheme and advantages of the utility model more clear and clear, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the utility model, for exemplary description of the principle of the utility model, and are not configured to limit the utility model. In addition, the components in the drawings are not necessarily drawn to scale. For example, the size of some components in the drawings can be enlarged for other components or areas to help understand the embodiments of the utility model.

[0028] The orientation words appearing in the following description are the directions shown in the drawings, and are not to limit the specific structure of the embodiments of the utility model. In the description of the utility model, it is to be explained that, unless otherwise specified, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0029] In addition, the terms "including", "containing", "having" or any other variants thereof are intended to cover non-exclusive inclusion, so that the inclusion of a series of component structures or components not only includes those components, but also includes other components not explicitly listed or inherent in the component, component. Without more limitation, the components defined by the sentence "including" do not exclude the presence of other same components in the article or device including the components.

[0030] Spatial relationship terms such as "below", "under", "under", "low", "above", "on", "high" are used to facilitate the description to explain the position of one element relative to the second element, which is intended to cover different orientations of the device in addition to the orientations shown in the drawings. In addition, for example, "one element is on / under another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and should not be considered as limiting. Similar terms indicate similar elements throughout the description.

[0031] For those skilled in the art, the utility model can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the utility model by showing examples of the utility model.

[0032] Traditional passive vibration control does not require external energy, the device is simple, easy to implement, has energy loss characteristics, and is economical and reliable, and the damping effect is satisfactory in many cases. However, passive vibration control lacks flexibility, and the increase in damping of the structure under weight and other constraints is also limited, and in some cases, it may even have the opposite effect. In addition, passive vibration isolation can have good effect on high-frequency vibration, but the control effect on low-frequency vibration is limited.

[0033] Active vibration isolation has strong self-adaptive ability and good low-frequency vibration isolation performance, and can quickly suppress vibration. However, active control is relatively complex in engineering, difficult to implement, and has high production cost. At present, there is an urgent need for wideband and fast vibration suppression in aerospace, and the existing vibration isolation structure cannot meet the requirements of wideband and fast vibration suppression. Based on this, the utility model provides a vibration isolator which integrates active vibration suppression and passive vibration suppression.

[0034] Referring to Figure 1 , the utility model provides a kind of vibration isolator, at least including viscous damping vibration ring 1, support ring outer ring 2, support ring inner ring 3, acquisition unit 4 and actuating unit 5.Viscous damping vibration ring 1 is fixedly arranged between support ring outer ring 2 and support ring inner ring 3, is connected by epoxy resin, to ensure that viscous damping vibration ring, support ring inner ring and support ring outer ring realize vibration transmission. Acquisition unit 4 is arranged in support ring inner ring 3, for collecting the vibration signal of support ring inner ring 3. Actuating unit 5 is arranged in support ring outer ring 2, for driving support ring outer ring 2 to occur and vibration signal reverse phase deformation.

[0035] Specifically, acquisition unit 4 is connected with actuating unit 5 in communication by control unit 6, when vibration occurs, acquisition unit 4 obtains the vibration signal of support ring inner ring 3 and then feedback to control unit 6, control unit 6 sends action instruction to actuating unit 5 according to control algorithm, so that actuating unit 5 drives support ring outer ring 2 to produce and vibration reverse phase deformation, to offset vibration and realize active vibration suppression.

[0036] Among them, support ring outer ring and support ring inner ring mainly play the role of supporting viscous damping vibration ring, and are also the carrier structure of viscous damping vibration ring, acquisition unit and actuating unit.

[0037] In the above embodiment, viscous damping vibration ring is mainly made of silicone rubber material, and its damping loss factor is greater than 0.1. It is placed between support ring inner ring and support ring outer ring to form a constraint damping structure. Under the action of vibration load, support ring inner ring and support ring outer ring bend and deform, so that the viscous damping structure layer shears and bends and deforms, and generates damping force.

[0038] Also referring to Figure 1 , Figure 2 and Figure 3 , in one embodiment, acquisition unit 4 includes a plurality of piezoelectric fiber sensors 41 uniformly distributed on support ring inner ring 3, and actuating unit 5 includes a plurality of piezoelectric fiber actuators 51 uniformly distributed on support ring outer ring 2. Piezoelectric fiber actuators 51 and piezoelectric fiber sensors 41 belong to piezoelectric driving devices, have high flexibility, and can be fixedly arranged on the circular arc surface of support ring inner ring 3 and support ring outer ring 2. Figure 2As shown, the length direction of the piezoelectric fiber actuator 51 and the piezoelectric fiber sensor 41 can be substantially consistent with the axial direction of the support ring inner ring 3 and the support ring outer ring 2 respectively.

[0039] The piezoelectric fiber sensor is of P2 type, adopts positive piezoelectric effect, and synchronously vibrates with the viscous damping ring by being bonded to the surface of the support ring inner ring. When the support ring inner ring vibrates or deforms, the piezoelectric fiber sensor generates corresponding electric charge and outputs to the controller. The greater the deformation of the support ring inner ring, the more electric charge is generated, so that the controller can detect the deformation and stress of the isolator.

[0040] The piezoelectric fiber actuator is of P1 type, and utilizes inverse piezoelectric effect. Each piezoelectric fiber actuator is bonded to the surface of the support ring outer ring in an extendable and retractable manner. After the controller receives the vibration signal sent by the piezoelectric fiber sensor, a certain voltage is loaded to the piezoelectric fiber actuator to make the piezoelectric fiber actuator elongate or contract, and drive the support ring outer ring to deform by being bonded to the surface of the support ring outer ring. The piezoelectric fiber has the characteristics of large displacement stroke and fast response, so when the vibration occurs, the piezoelectric fiber actuator can quickly generate deformation in the opposite phase of the vibration and drive the support ring outer ring to deform, thereby canceling the vibration and achieving the effect of active vibration suppression.

[0041] The viscous damping ring is distributed between the support ring inner ring and the support ring outer ring, and forms an active constrained layer damping structure in combination with the piezoelectric fiber sensor and the piezoelectric fiber actuator. When the vibration occurs, in addition to passive damping of the viscous damping ring, the active damping of the active constrained layer damping structure can increase the deformation of the damping structure, thereby increasing energy dissipation and achieving rapid suppression of the vibration.

[0042] The isolator of the embodiment adopts the strategy of combining active vibration control and passive vibration control for damping, has strong flexibility and environmental adaptability, wide controllable frequency band, fast response speed, flexible control algorithm selection, good control effect, and can be widely applied at least in the field of structural vibration and noise control.

[0043] Meanwhile, referring to Figure 1 , Figure 2 and Figure 3In the above embodiment, the controller 6 comprises a signal acquisition unit 61, a control algorithm unit 62 and a signal amplification unit 63. One end of the signal acquisition unit 61 is in communication connection with the piezoelectric fiber sensor 41, and the other end is in communication connection with the input end of the control algorithm unit 62. The output end of the control algorithm unit is in communication connection with the piezoelectric fiber actuator 51 through the signal amplification unit 63. When vibration occurs, the viscous damping vibration ring 1 shears and deforms and consumes part of the vibration energy. At the same time, the piezoelectric fiber sensor 41 detects the vibration physical quantity of the vibration isolator structure, and then converts it into an electrical signal which is detected by the signal acquisition unit 61 in the controller. Under the action of the control algorithm unit 62, a control instruction signal is generated. The control instruction signal is transmitted to the piezoelectric fiber actuator 51 after passing through the signal amplification unit 63. The piezoelectric fiber actuator 51 generates a control force or torque and acts on the support ring outer circle 2 and the viscous damping vibration ring 1, so as to further strengthen the shear deformation of the support ring outer circle 1 and enhance the damping force of the active constraint layer damping structure, thereby improving the vibration energy dissipation capability.

[0044] The vibration isolator of the embodiment of the utility model can achieve a wider vibration suppression frequency band under the joint action of low-frequency vibration suppression of the active control algorithm and high-frequency vibration suppression of the viscoelastic material, and the vibration suppression effect is better. The vibration isolator of the utility model increases the stability and robustness of the active control system under the action of the damping structure. Even if the active action fails and the active constraint damping structure degenerates into a passive constraint damping structure, the system can still maintain the passive constraint damping effect, and the vibration isolator still has a certain vibration suppression function.

[0045] The vibration isolator of the embodiment of the utility model takes the NI board card as a data acquisition module, and the board card has A / D and D / A conversion functions. The control algorithm unit can select an AMD piezoelectric fiber controller which can output a voltage output of-500V to 1500V. The signal amplification unit selects a smartCharge board card type charge amplifier which can monitor the deformation information of the piezoelectric fiber.

[0046] Referring to Figure 3 In one embodiment, in order to ensure the accuracy of the collected vibration signal and the timeliness and effectiveness of the active vibration suppression, the number of piezoelectric fiber sensors 41 and piezoelectric fiber actuators 51 can be set to be the same. For example, six piezoelectric fiber sensors are arranged, and six piezoelectric fiber actuators are also arranged.

[0047] Referring to Figure 1 In the above embodiment, the vibration isolator of the utility model further comprises an energy component 8 connected with the acquisition unit 4, the actuation unit 5 and the control unit 6 respectively. The energy component 8 is used for providing energy for the acquisition unit 4, the actuation unit 5 and the control unit 6.

[0048] Referring to Figure 2In any one of the above embodiments, in order to facilitate the fixing connection of the vibration isolator of the utility model with other equipment, the connector 7 can be arranged on the outer ring 2 of the support ring. The connector of the embodiment can be arranged in two, and the two connectors 7 are oppositely arranged on the radial sides of the outer ring 2 of the support ring.

[0049] Figure 4 The acceleration response curve contrast diagram of the input and output points of the control unit of the vibration isolator of the utility model is shown in the figure. In the figure, the first half of the curve is the acceleration response curve before the control unit is connected, and the second half of the curve is the acceleration response curve after the control unit is connected. It can be seen from the figure that the amplitude of the vibration acceleration amplitude has a significant decrease after the control unit is connected.

[0050] The above embodiments can be combined with each other and have corresponding technical effects.

[0051] The vibration isolator of the utility model adopts the design scheme of combining active vibration isolation and passive vibration isolation, can passively suppress vibration through the damping structure, and can actively suppress vibration through the actuator. The active and passive combination has better adaptability. Under the joint action of the low-frequency vibration suppression of active control and the high-frequency vibration suppression of viscoelastic material, the vibration isolator of the utility model can effectively suppress vibration in a wide frequency range.

[0052] The above is only a preferred embodiment of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An isolator characterized by, It includes at least: a viscous damping shock absorber ring, an outer ring of the support ring, an inner ring of the support ring, a data acquisition unit, and an actuation unit; The viscous damping shock absorption ring is fixedly disposed between the outer ring of the support ring and the inner ring of the support ring. The acquisition unit is disposed in the inner ring of the support ring, and the actuation unit is disposed in the outer ring of the support ring. The acquisition unit is communicatively connected to the actuation unit through the control unit. After acquiring the vibration signal of the inner ring of the support ring, the acquisition unit feeds it back to the control unit. The control unit issues an action command to the actuation unit, causing the actuation unit to drive the outer ring of the support ring to produce a deformation opposite to the vibration, thereby canceling the vibration and achieving active vibration suppression.

2. The vibration isolator of claim 1, wherein The acquisition unit includes multiple piezoelectric fiber sensors evenly distributed within the inner ring of the support ring.

3. The vibration isolator of claim 2, wherein The actuation unit includes a plurality of piezoelectric fiber actuators evenly distributed on the outer ring of the support ring.

4. The vibration isolator according to claim 3, characterized in that, Each of the piezoelectric fiber actuators is retractably attached to the outer ring of the support ring.

5. The vibration isolator according to claim 4, characterized in that, The controller includes a signal acquisition unit, a control algorithm unit, and a signal amplification unit; one end of the signal acquisition unit is communicatively connected to the piezoelectric fiber sensor, and the other end is communicatively connected to the input end of the control algorithm unit; the output end of the control algorithm unit is communicatively connected to the piezoelectric fiber actuator through the signal amplification unit.

6. The vibration isolator according to claim 5, characterized in that, The number of piezoelectric fiber sensors is the same as the number of piezoelectric fiber actuators.

7. The vibration isolator according to claim 6, characterized in that, The piezoelectric fiber sensor is provided in six units; the piezoelectric fiber actuator is provided in six units.

8. The vibration isolator according to claim 7, characterized in that, It also includes a connector for connecting to an external device; the connector is disposed on the outer ring of the support ring.

9. The vibration isolator according to any one of claims 1 to 8, characterized in that, It also includes an energy component that is connected to the acquisition unit, the actuation unit and the control unit respectively; the energy component is used to provide energy to the acquisition unit, the actuation unit and the control unit.

10. The vibration isolator according to claim 9, characterized in that, The acquisition unit includes at least an NI board.

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